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6b7d8f8b TK |
1 | /* |
2 | * altera_uart.c -- Altera UART driver | |
3 | * | |
4 | * Based on mcf.c -- Freescale ColdFire UART driver | |
5 | * | |
6 | * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com> | |
7 | * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw> | |
8 | * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
2f8b9c15 | 18 | #include <linux/timer.h> |
6b7d8f8b TK |
19 | #include <linux/interrupt.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/console.h> | |
22 | #include <linux/tty.h> | |
23 | #include <linux/tty_flip.h> | |
24 | #include <linux/serial.h> | |
25 | #include <linux/serial_core.h> | |
26 | #include <linux/platform_device.h> | |
7c9325d7 | 27 | #include <linux/of.h> |
6b7d8f8b TK |
28 | #include <linux/io.h> |
29 | #include <linux/altera_uart.h> | |
30 | ||
31 | #define DRV_NAME "altera_uart" | |
99793c66 AV |
32 | #define SERIAL_ALTERA_MAJOR 204 |
33 | #define SERIAL_ALTERA_MINOR 213 | |
6b7d8f8b TK |
34 | |
35 | /* | |
36 | * Altera UART register definitions according to the Nios UART datasheet: | |
37 | * http://www.altera.com/literature/ds/ds_nios_uart.pdf | |
38 | */ | |
39 | ||
40 | #define ALTERA_UART_SIZE 32 | |
41 | ||
42 | #define ALTERA_UART_RXDATA_REG 0 | |
43 | #define ALTERA_UART_TXDATA_REG 4 | |
44 | #define ALTERA_UART_STATUS_REG 8 | |
45 | #define ALTERA_UART_CONTROL_REG 12 | |
46 | #define ALTERA_UART_DIVISOR_REG 16 | |
47 | #define ALTERA_UART_EOP_REG 20 | |
48 | ||
49 | #define ALTERA_UART_STATUS_PE_MSK 0x0001 /* parity error */ | |
50 | #define ALTERA_UART_STATUS_FE_MSK 0x0002 /* framing error */ | |
51 | #define ALTERA_UART_STATUS_BRK_MSK 0x0004 /* break */ | |
52 | #define ALTERA_UART_STATUS_ROE_MSK 0x0008 /* RX overrun error */ | |
53 | #define ALTERA_UART_STATUS_TOE_MSK 0x0010 /* TX overrun error */ | |
54 | #define ALTERA_UART_STATUS_TMT_MSK 0x0020 /* TX shift register state */ | |
55 | #define ALTERA_UART_STATUS_TRDY_MSK 0x0040 /* TX ready */ | |
56 | #define ALTERA_UART_STATUS_RRDY_MSK 0x0080 /* RX ready */ | |
57 | #define ALTERA_UART_STATUS_E_MSK 0x0100 /* exception condition */ | |
58 | #define ALTERA_UART_STATUS_DCTS_MSK 0x0400 /* CTS logic-level change */ | |
59 | #define ALTERA_UART_STATUS_CTS_MSK 0x0800 /* CTS logic state */ | |
60 | #define ALTERA_UART_STATUS_EOP_MSK 0x1000 /* EOP written/read */ | |
61 | ||
62 | /* Enable interrupt on... */ | |
63 | #define ALTERA_UART_CONTROL_PE_MSK 0x0001 /* ...parity error */ | |
64 | #define ALTERA_UART_CONTROL_FE_MSK 0x0002 /* ...framing error */ | |
65 | #define ALTERA_UART_CONTROL_BRK_MSK 0x0004 /* ...break */ | |
66 | #define ALTERA_UART_CONTROL_ROE_MSK 0x0008 /* ...RX overrun */ | |
67 | #define ALTERA_UART_CONTROL_TOE_MSK 0x0010 /* ...TX overrun */ | |
68 | #define ALTERA_UART_CONTROL_TMT_MSK 0x0020 /* ...TX shift register empty */ | |
69 | #define ALTERA_UART_CONTROL_TRDY_MSK 0x0040 /* ...TX ready */ | |
70 | #define ALTERA_UART_CONTROL_RRDY_MSK 0x0080 /* ...RX ready */ | |
71 | #define ALTERA_UART_CONTROL_E_MSK 0x0100 /* ...exception*/ | |
72 | ||
73 | #define ALTERA_UART_CONTROL_TRBK_MSK 0x0200 /* TX break */ | |
74 | #define ALTERA_UART_CONTROL_DCTS_MSK 0x0400 /* Interrupt on CTS change */ | |
75 | #define ALTERA_UART_CONTROL_RTS_MSK 0x0800 /* RTS signal */ | |
76 | #define ALTERA_UART_CONTROL_EOP_MSK 0x1000 /* Interrupt on EOP */ | |
77 | ||
78 | /* | |
79 | * Local per-uart structure. | |
80 | */ | |
81 | struct altera_uart { | |
82 | struct uart_port port; | |
2f8b9c15 | 83 | struct timer_list tmr; |
6b7d8f8b TK |
84 | unsigned int sigs; /* Local copy of line sigs */ |
85 | unsigned short imr; /* Local IMR mirror */ | |
86 | }; | |
87 | ||
0d426eda AV |
88 | static u32 altera_uart_readl(struct uart_port *port, int reg) |
89 | { | |
2780ad42 | 90 | return readl(port->membase + (reg << port->regshift)); |
0d426eda AV |
91 | } |
92 | ||
93 | static void altera_uart_writel(struct uart_port *port, u32 dat, int reg) | |
94 | { | |
2780ad42 | 95 | writel(dat, port->membase + (reg << port->regshift)); |
0d426eda AV |
96 | } |
97 | ||
6b7d8f8b TK |
98 | static unsigned int altera_uart_tx_empty(struct uart_port *port) |
99 | { | |
0d426eda | 100 | return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & |
6b7d8f8b TK |
101 | ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0; |
102 | } | |
103 | ||
104 | static unsigned int altera_uart_get_mctrl(struct uart_port *port) | |
105 | { | |
106 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
6b7d8f8b TK |
107 | unsigned int sigs; |
108 | ||
0d426eda | 109 | sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & |
6b7d8f8b TK |
110 | ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0; |
111 | sigs |= (pp->sigs & TIOCM_RTS); | |
6b7d8f8b TK |
112 | |
113 | return sigs; | |
114 | } | |
115 | ||
116 | static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs) | |
117 | { | |
118 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
6b7d8f8b | 119 | |
6b7d8f8b TK |
120 | pp->sigs = sigs; |
121 | if (sigs & TIOCM_RTS) | |
122 | pp->imr |= ALTERA_UART_CONTROL_RTS_MSK; | |
123 | else | |
124 | pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK; | |
0d426eda | 125 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
126 | } |
127 | ||
128 | static void altera_uart_start_tx(struct uart_port *port) | |
129 | { | |
130 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
6b7d8f8b | 131 | |
6b7d8f8b | 132 | pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK; |
0d426eda | 133 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
134 | } |
135 | ||
136 | static void altera_uart_stop_tx(struct uart_port *port) | |
137 | { | |
138 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
6b7d8f8b | 139 | |
6b7d8f8b | 140 | pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; |
0d426eda | 141 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
142 | } |
143 | ||
144 | static void altera_uart_stop_rx(struct uart_port *port) | |
145 | { | |
146 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
6b7d8f8b | 147 | |
6b7d8f8b | 148 | pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK; |
0d426eda | 149 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
150 | } |
151 | ||
152 | static void altera_uart_break_ctl(struct uart_port *port, int break_state) | |
153 | { | |
154 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
155 | unsigned long flags; | |
156 | ||
157 | spin_lock_irqsave(&port->lock, flags); | |
158 | if (break_state == -1) | |
159 | pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK; | |
160 | else | |
161 | pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK; | |
0d426eda | 162 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
163 | spin_unlock_irqrestore(&port->lock, flags); |
164 | } | |
165 | ||
166 | static void altera_uart_enable_ms(struct uart_port *port) | |
167 | { | |
168 | } | |
169 | ||
170 | static void altera_uart_set_termios(struct uart_port *port, | |
171 | struct ktermios *termios, | |
172 | struct ktermios *old) | |
173 | { | |
174 | unsigned long flags; | |
175 | unsigned int baud, baudclk; | |
176 | ||
177 | baud = uart_get_baud_rate(port, termios, old, 0, 4000000); | |
178 | baudclk = port->uartclk / baud; | |
179 | ||
180 | if (old) | |
181 | tty_termios_copy_hw(termios, old); | |
182 | tty_termios_encode_baud_rate(termios, baud, baud); | |
183 | ||
184 | spin_lock_irqsave(&port->lock, flags); | |
2f8b9c15 | 185 | uart_update_timeout(port, termios->c_cflag, baud); |
0d426eda | 186 | altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG); |
6b7d8f8b TK |
187 | spin_unlock_irqrestore(&port->lock, flags); |
188 | } | |
189 | ||
190 | static void altera_uart_rx_chars(struct altera_uart *pp) | |
191 | { | |
192 | struct uart_port *port = &pp->port; | |
193 | unsigned char ch, flag; | |
194 | unsigned short status; | |
195 | ||
0d426eda | 196 | while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) & |
6b7d8f8b | 197 | ALTERA_UART_STATUS_RRDY_MSK) { |
0d426eda | 198 | ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG); |
6b7d8f8b TK |
199 | flag = TTY_NORMAL; |
200 | port->icount.rx++; | |
201 | ||
202 | if (status & ALTERA_UART_STATUS_E_MSK) { | |
0d426eda AV |
203 | altera_uart_writel(port, status, |
204 | ALTERA_UART_STATUS_REG); | |
6b7d8f8b TK |
205 | |
206 | if (status & ALTERA_UART_STATUS_BRK_MSK) { | |
207 | port->icount.brk++; | |
208 | if (uart_handle_break(port)) | |
209 | continue; | |
210 | } else if (status & ALTERA_UART_STATUS_PE_MSK) { | |
211 | port->icount.parity++; | |
212 | } else if (status & ALTERA_UART_STATUS_ROE_MSK) { | |
213 | port->icount.overrun++; | |
214 | } else if (status & ALTERA_UART_STATUS_FE_MSK) { | |
215 | port->icount.frame++; | |
216 | } | |
217 | ||
218 | status &= port->read_status_mask; | |
219 | ||
220 | if (status & ALTERA_UART_STATUS_BRK_MSK) | |
221 | flag = TTY_BREAK; | |
222 | else if (status & ALTERA_UART_STATUS_PE_MSK) | |
223 | flag = TTY_PARITY; | |
224 | else if (status & ALTERA_UART_STATUS_FE_MSK) | |
225 | flag = TTY_FRAME; | |
226 | } | |
227 | ||
228 | if (uart_handle_sysrq_char(port, ch)) | |
229 | continue; | |
230 | uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch, | |
231 | flag); | |
232 | } | |
233 | ||
234 | tty_flip_buffer_push(port->state->port.tty); | |
235 | } | |
236 | ||
237 | static void altera_uart_tx_chars(struct altera_uart *pp) | |
238 | { | |
239 | struct uart_port *port = &pp->port; | |
240 | struct circ_buf *xmit = &port->state->xmit; | |
241 | ||
242 | if (port->x_char) { | |
243 | /* Send special char - probably flow control */ | |
0d426eda | 244 | altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG); |
6b7d8f8b TK |
245 | port->x_char = 0; |
246 | port->icount.tx++; | |
247 | return; | |
248 | } | |
249 | ||
0d426eda | 250 | while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & |
6b7d8f8b TK |
251 | ALTERA_UART_STATUS_TRDY_MSK) { |
252 | if (xmit->head == xmit->tail) | |
253 | break; | |
0d426eda AV |
254 | altera_uart_writel(port, xmit->buf[xmit->tail], |
255 | ALTERA_UART_TXDATA_REG); | |
6b7d8f8b TK |
256 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
257 | port->icount.tx++; | |
258 | } | |
259 | ||
260 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
261 | uart_write_wakeup(port); | |
262 | ||
263 | if (xmit->head == xmit->tail) { | |
264 | pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; | |
0d426eda | 265 | altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); |
6b7d8f8b TK |
266 | } |
267 | } | |
268 | ||
269 | static irqreturn_t altera_uart_interrupt(int irq, void *data) | |
270 | { | |
271 | struct uart_port *port = data; | |
272 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
273 | unsigned int isr; | |
274 | ||
0d426eda | 275 | isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr; |
d8d721f4 TK |
276 | |
277 | spin_lock(&port->lock); | |
6b7d8f8b TK |
278 | if (isr & ALTERA_UART_STATUS_RRDY_MSK) |
279 | altera_uart_rx_chars(pp); | |
280 | if (isr & ALTERA_UART_STATUS_TRDY_MSK) | |
281 | altera_uart_tx_chars(pp); | |
d8d721f4 TK |
282 | spin_unlock(&port->lock); |
283 | ||
6b7d8f8b TK |
284 | return IRQ_RETVAL(isr); |
285 | } | |
286 | ||
2f8b9c15 AV |
287 | static void altera_uart_timer(unsigned long data) |
288 | { | |
289 | struct uart_port *port = (void *)data; | |
290 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
291 | ||
292 | altera_uart_interrupt(0, port); | |
293 | mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port)); | |
294 | } | |
295 | ||
6b7d8f8b TK |
296 | static void altera_uart_config_port(struct uart_port *port, int flags) |
297 | { | |
298 | port->type = PORT_ALTERA_UART; | |
299 | ||
300 | /* Clear mask, so no surprise interrupts. */ | |
0d426eda | 301 | altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG); |
6b7d8f8b | 302 | /* Clear status register */ |
0d426eda | 303 | altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG); |
6b7d8f8b TK |
304 | } |
305 | ||
306 | static int altera_uart_startup(struct uart_port *port) | |
307 | { | |
308 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
309 | unsigned long flags; | |
310 | int ret; | |
311 | ||
2f8b9c15 AV |
312 | if (!port->irq) { |
313 | setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port); | |
314 | mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port)); | |
315 | return 0; | |
316 | } | |
317 | ||
9cfb5c05 | 318 | ret = request_irq(port->irq, altera_uart_interrupt, 0, |
6b7d8f8b TK |
319 | DRV_NAME, port); |
320 | if (ret) { | |
321 | pr_err(DRV_NAME ": unable to attach Altera UART %d " | |
322 | "interrupt vector=%d\n", port->line, port->irq); | |
323 | return ret; | |
324 | } | |
325 | ||
326 | spin_lock_irqsave(&port->lock, flags); | |
327 | ||
328 | /* Enable RX interrupts now */ | |
329 | pp->imr = ALTERA_UART_CONTROL_RRDY_MSK; | |
330 | writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); | |
331 | ||
332 | spin_unlock_irqrestore(&port->lock, flags); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static void altera_uart_shutdown(struct uart_port *port) | |
338 | { | |
339 | struct altera_uart *pp = container_of(port, struct altera_uart, port); | |
340 | unsigned long flags; | |
341 | ||
342 | spin_lock_irqsave(&port->lock, flags); | |
343 | ||
344 | /* Disable all interrupts now */ | |
345 | pp->imr = 0; | |
346 | writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG); | |
347 | ||
348 | spin_unlock_irqrestore(&port->lock, flags); | |
349 | ||
2f8b9c15 AV |
350 | if (port->irq) |
351 | free_irq(port->irq, port); | |
352 | else | |
353 | del_timer_sync(&pp->tmr); | |
6b7d8f8b TK |
354 | } |
355 | ||
356 | static const char *altera_uart_type(struct uart_port *port) | |
357 | { | |
358 | return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL; | |
359 | } | |
360 | ||
361 | static int altera_uart_request_port(struct uart_port *port) | |
362 | { | |
363 | /* UARTs always present */ | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static void altera_uart_release_port(struct uart_port *port) | |
368 | { | |
369 | /* Nothing to release... */ | |
370 | } | |
371 | ||
372 | static int altera_uart_verify_port(struct uart_port *port, | |
373 | struct serial_struct *ser) | |
374 | { | |
375 | if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART)) | |
376 | return -EINVAL; | |
377 | return 0; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Define the basic serial functions we support. | |
382 | */ | |
383 | static struct uart_ops altera_uart_ops = { | |
384 | .tx_empty = altera_uart_tx_empty, | |
385 | .get_mctrl = altera_uart_get_mctrl, | |
386 | .set_mctrl = altera_uart_set_mctrl, | |
387 | .start_tx = altera_uart_start_tx, | |
388 | .stop_tx = altera_uart_stop_tx, | |
389 | .stop_rx = altera_uart_stop_rx, | |
390 | .enable_ms = altera_uart_enable_ms, | |
391 | .break_ctl = altera_uart_break_ctl, | |
392 | .startup = altera_uart_startup, | |
393 | .shutdown = altera_uart_shutdown, | |
394 | .set_termios = altera_uart_set_termios, | |
395 | .type = altera_uart_type, | |
396 | .request_port = altera_uart_request_port, | |
397 | .release_port = altera_uart_release_port, | |
398 | .config_port = altera_uart_config_port, | |
399 | .verify_port = altera_uart_verify_port, | |
400 | }; | |
401 | ||
402 | static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS]; | |
403 | ||
404 | #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) | |
405 | ||
fadf34f0 | 406 | static void altera_uart_console_putc(struct uart_port *port, const char c) |
6b7d8f8b | 407 | { |
0d426eda | 408 | while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & |
e8dd4757 | 409 | ALTERA_UART_STATUS_TRDY_MSK)) |
fadf34f0 | 410 | cpu_relax(); |
6b7d8f8b | 411 | |
6b7d8f8b | 412 | writel(c, port->membase + ALTERA_UART_TXDATA_REG); |
6b7d8f8b TK |
413 | } |
414 | ||
415 | static void altera_uart_console_write(struct console *co, const char *s, | |
416 | unsigned int count) | |
417 | { | |
fadf34f0 TK |
418 | struct uart_port *port = &(altera_uart_ports + co->index)->port; |
419 | ||
6b7d8f8b | 420 | for (; count; count--, s++) { |
fadf34f0 | 421 | altera_uart_console_putc(port, *s); |
6b7d8f8b | 422 | if (*s == '\n') |
fadf34f0 | 423 | altera_uart_console_putc(port, '\r'); |
6b7d8f8b TK |
424 | } |
425 | } | |
426 | ||
427 | static int __init altera_uart_console_setup(struct console *co, char *options) | |
428 | { | |
429 | struct uart_port *port; | |
430 | int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE; | |
431 | int bits = 8; | |
432 | int parity = 'n'; | |
433 | int flow = 'n'; | |
434 | ||
435 | if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS) | |
436 | return -EINVAL; | |
437 | port = &altera_uart_ports[co->index].port; | |
70eebd0b | 438 | if (!port->membase) |
6b7d8f8b TK |
439 | return -ENODEV; |
440 | ||
441 | if (options) | |
442 | uart_parse_options(options, &baud, &parity, &bits, &flow); | |
443 | ||
444 | return uart_set_options(port, co, baud, parity, bits, flow); | |
445 | } | |
446 | ||
447 | static struct uart_driver altera_uart_driver; | |
448 | ||
449 | static struct console altera_uart_console = { | |
99793c66 | 450 | .name = "ttyAL", |
6b7d8f8b TK |
451 | .write = altera_uart_console_write, |
452 | .device = uart_console_device, | |
453 | .setup = altera_uart_console_setup, | |
454 | .flags = CON_PRINTBUFFER, | |
455 | .index = -1, | |
456 | .data = &altera_uart_driver, | |
457 | }; | |
458 | ||
459 | static int __init altera_uart_console_init(void) | |
460 | { | |
461 | register_console(&altera_uart_console); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | console_initcall(altera_uart_console_init); | |
466 | ||
467 | #define ALTERA_UART_CONSOLE (&altera_uart_console) | |
468 | ||
469 | #else | |
470 | ||
471 | #define ALTERA_UART_CONSOLE NULL | |
472 | ||
473 | #endif /* CONFIG_ALTERA_UART_CONSOLE */ | |
474 | ||
475 | /* | |
476 | * Define the altera_uart UART driver structure. | |
477 | */ | |
478 | static struct uart_driver altera_uart_driver = { | |
479 | .owner = THIS_MODULE, | |
480 | .driver_name = DRV_NAME, | |
99793c66 AV |
481 | .dev_name = "ttyAL", |
482 | .major = SERIAL_ALTERA_MAJOR, | |
483 | .minor = SERIAL_ALTERA_MINOR, | |
6b7d8f8b TK |
484 | .nr = CONFIG_SERIAL_ALTERA_UART_MAXPORTS, |
485 | .cons = ALTERA_UART_CONSOLE, | |
486 | }; | |
487 | ||
7c9325d7 TK |
488 | #ifdef CONFIG_OF |
489 | static int altera_uart_get_of_uartclk(struct platform_device *pdev, | |
490 | struct uart_port *port) | |
491 | { | |
492 | int len; | |
493 | const __be32 *clk; | |
494 | ||
495 | clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len); | |
496 | if (!clk || len < sizeof(__be32)) | |
497 | return -ENODEV; | |
498 | ||
499 | port->uartclk = be32_to_cpup(clk); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | #else | |
504 | static int altera_uart_get_of_uartclk(struct platform_device *pdev, | |
505 | struct uart_port *port) | |
506 | { | |
507 | return -ENODEV; | |
508 | } | |
509 | #endif /* CONFIG_OF */ | |
510 | ||
6b7d8f8b TK |
511 | static int __devinit altera_uart_probe(struct platform_device *pdev) |
512 | { | |
513 | struct altera_uart_platform_uart *platp = pdev->dev.platform_data; | |
514 | struct uart_port *port; | |
6b5756f1 AV |
515 | struct resource *res_mem; |
516 | struct resource *res_irq; | |
517 | int i = pdev->id; | |
7c9325d7 | 518 | int ret; |
6b7d8f8b | 519 | |
a664ec96 TK |
520 | /* if id is -1 scan for a free id and use that one */ |
521 | if (i == -1) { | |
522 | for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++) | |
523 | if (altera_uart_ports[i].port.mapbase == 0) | |
524 | break; | |
525 | } | |
6b7d8f8b | 526 | |
a664ec96 | 527 | if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS) |
6b5756f1 | 528 | return -EINVAL; |
6b7d8f8b | 529 | |
6b5756f1 AV |
530 | port = &altera_uart_ports[i].port; |
531 | ||
532 | res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
533 | if (res_mem) | |
534 | port->mapbase = res_mem->start; | |
535 | else if (platp->mapbase) | |
536 | port->mapbase = platp->mapbase; | |
537 | else | |
538 | return -EINVAL; | |
539 | ||
540 | res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
541 | if (res_irq) | |
542 | port->irq = res_irq->start; | |
543 | else if (platp->irq) | |
544 | port->irq = platp->irq; | |
545 | ||
7c9325d7 TK |
546 | /* Check platform data first so we can override device node data */ |
547 | if (platp) | |
548 | port->uartclk = platp->uartclk; | |
549 | else { | |
550 | ret = altera_uart_get_of_uartclk(pdev, port); | |
551 | if (ret) | |
552 | return ret; | |
553 | } | |
554 | ||
6b5756f1 AV |
555 | port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE); |
556 | if (!port->membase) | |
557 | return -ENOMEM; | |
558 | ||
2780ad42 TK |
559 | if (platp) |
560 | port->regshift = platp->bus_shift; | |
561 | else | |
562 | port->regshift = 0; | |
563 | ||
6b5756f1 AV |
564 | port->line = i; |
565 | port->type = PORT_ALTERA_UART; | |
566 | port->iotype = SERIAL_IO_MEM; | |
6b5756f1 | 567 | port->ops = &altera_uart_ops; |
288e9feb | 568 | port->flags = UPF_BOOT_AUTOCONF; |
6b5756f1 | 569 | |
a664ec96 TK |
570 | dev_set_drvdata(&pdev->dev, port); |
571 | ||
6b5756f1 | 572 | uart_add_one_port(&altera_uart_driver, port); |
6b7d8f8b TK |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
c1bfffa9 | 577 | static int __devexit altera_uart_remove(struct platform_device *pdev) |
6b7d8f8b | 578 | { |
a664ec96 | 579 | struct uart_port *port = dev_get_drvdata(&pdev->dev); |
6b7d8f8b | 580 | |
a664ec96 TK |
581 | if (port) { |
582 | uart_remove_one_port(&altera_uart_driver, port); | |
583 | dev_set_drvdata(&pdev->dev, NULL); | |
584 | port->mapbase = 0; | |
585 | } | |
e96fabd8 | 586 | |
6b7d8f8b TK |
587 | return 0; |
588 | } | |
589 | ||
7c9325d7 TK |
590 | #ifdef CONFIG_OF |
591 | static struct of_device_id altera_uart_match[] = { | |
592 | { .compatible = "ALTR,uart-1.0", }, | |
593 | {}, | |
594 | }; | |
595 | MODULE_DEVICE_TABLE(of, altera_uart_match); | |
7c9325d7 TK |
596 | #endif /* CONFIG_OF */ |
597 | ||
6b7d8f8b TK |
598 | static struct platform_driver altera_uart_platform_driver = { |
599 | .probe = altera_uart_probe, | |
600 | .remove = __devexit_p(altera_uart_remove), | |
601 | .driver = { | |
7c9325d7 TK |
602 | .name = DRV_NAME, |
603 | .owner = THIS_MODULE, | |
85888069 | 604 | .of_match_table = of_match_ptr(altera_uart_match), |
6b7d8f8b TK |
605 | }, |
606 | }; | |
607 | ||
608 | static int __init altera_uart_init(void) | |
609 | { | |
610 | int rc; | |
611 | ||
612 | rc = uart_register_driver(&altera_uart_driver); | |
613 | if (rc) | |
614 | return rc; | |
615 | rc = platform_driver_register(&altera_uart_platform_driver); | |
616 | if (rc) { | |
617 | uart_unregister_driver(&altera_uart_driver); | |
618 | return rc; | |
619 | } | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static void __exit altera_uart_exit(void) | |
624 | { | |
625 | platform_driver_unregister(&altera_uart_platform_driver); | |
626 | uart_unregister_driver(&altera_uart_driver); | |
627 | } | |
628 | ||
629 | module_init(altera_uart_init); | |
630 | module_exit(altera_uart_exit); | |
631 | ||
632 | MODULE_DESCRIPTION("Altera UART driver"); | |
633 | MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>"); | |
634 | MODULE_LICENSE("GPL"); | |
635 | MODULE_ALIAS("platform:" DRV_NAME); | |
99793c66 | 636 | MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR); |